Portable telephone



Dec. 1 7, 1929.

R. s. COOPER 1,739,503

PORTABLE TELEPHONE Filed March 29, 1927 3 Sheets-Sheet l INVENTOR,

T5 ZZJ Coo 29ers BY ATTORNEY.

Dec. 17, 1929. R. s. COOPER PORTABLE TELEPHONE 3 Sheets-Sheet 2 Filed March 29, 1927 Dec. 17, 1929. s, COOPER 1,739,503

PORTABLE TELEPHONE Filed March 2 1927 3 Sheets-Sheet 3 INVENTOR,

I Y I y ATTORNEY.

Patented Dec. 17, 1929 PATENT OFFICE.

ROBERT S. COOPER, OF OONNELLSVIIiLE, PENNSYLVANIA PORTABLE T LEPHONE Application filed March 23 This invention relates to a portable teleph n One important object of the invention is to provide a portable telephone suitable for use as a utility telephone or test set by telephone companies; for use by power companies as a portable telephone to be carried on street cars, passenger and freight trains, for emergency calls; and for use in mines, the forestry service and othervplaces where simplicity and ruggedness of construction are essential features.

A second important object of the invention is to provide an improved portable telephone wherein the construction is such that the operating parts of the telephone are so insulated from the user that all possibility of shocks and injury due to high tension currents being short circuited through the telephone are positively prevented.

A third important object of the invention is to provide an improved portable telephone wherein all the working parts are contained in a telephone box or casing made of such material as has high insulating quality and is weatherproof, the material being molded for instance of a hard rubber composition.

A fourth important objectv of the invention is to provide ampleinsulation between :0 the ear of the user and the receiver diaphragm by an improved construction of the casing.

A fifth important object of the invention is to provide an improved construction of telephone wherein the crank for the mag- 85 neto will be thoroughly insulated from the metallic parts of the telephone.

With the above and other objects in view as will be hereinafter apparent, the invention consists in general of certainnovel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings and specifically claimed.

In the accompanying drawings like charaeters of reference indicate like parts in the several views, and:

Figure 1 is a front view of a telephone constructed in accordance with this invention. Figure 2 is a side view thereof taken from the crank side.

, 1927. Serial No. 179,279.

Figure 3 is a rear view of the telephone with the cover for the case removed. Y

Figure 1 is a section on the line 4- 1 of Figure 3.

Figure '5 is a section on the line 55 of Figure 4.

Figure 6 is a view disclosing the wiring diagram of the telephone.

Figure 7 is an enlarged sectional view disclosing one of the attaching hooks or clips used herewith.

' In the construction'of the present embodiment of the invention there is provided a casing which consists of ainain casing memher or body having a bottom 10, side walls 11 and top 12'. These parts are molded in tegrally' from a single mass of suitable plastic material having a high dielectric strength and being at the same time thoroughly water proof. The walls of this casing are sufficiently thick to resist puncture by any short circuiting which may occur within the mechanism of. the telephone or between different parts thereof. This casing also is provided with a front wall formed integrally with the other parts as at 18 and at the upper end of the front wall 13 there is provided a boss 14 having an opening 15 therein and constituting the receiver ear-piece. Similarly, at the bottom the front wall is provided with an upturned boss 16 having a frustoconioa1 opening 17 therein constituting the mouthpiece of the telephone, the openings 15 and 17 being arranged substantially at right angles to each other. Against the front wall 13 there is mounted a panel 18 of insulating material and screwed into this panel at its upper part is a tube 19 which terminates rearwardly in a receiver 20. From this receiver, wires 21 lead to binding posts or clips 22, mounted on a binding post strip 23, carried by the panel 18. The ,top part of the panel 18 is held against the front wall 13 by the receiver-tube 19 and a rubber cushion 24, the latter being embraced between the rear end of the receiver 20 and a removable rear wall when the latter is in place. rubber cushion 25 is located at the rear end of the transmitter which has its mouth-piece 17 opening upwardly towards the receiverwire 31 with one'of the posts or clips 22.

The other post or clip is connected by a wire 32 with the usual induction coil '33. From this coil, a wire 34 leads to the other movable contact of the key 29 and this last movable contact, upon the key button being pushed in, engages a fixed contact 35 which is connected by a wire 36 with a transmitter 37, this latter being alined with the inner end of the mouth-piece 17 so that words spoken into this mouth-piece actuate the transmitter. From this transmitter, there also leads a wire 38, which extends to the battery 39 for operating the telephone, and this battery is mounted in a suitable holder 40 supported within the casing. From the battery, a wire 41 leads to a binding post or clip 42 to which one of the line connecting wires 43 is connected. These line connecting wires 43, when the telephone is not in use,

are wound on a suitable support 44 at one side of the casing; The binding post 42 is also connected by a wire 45 with the induction coil 33. A third wire 46 leads to a hand generator 47, and the shaft 48 of this hand generator is so arranged, that when the crank is operated, the shaft will push against a tongue. 49 which issconnected by a wire 50 with a binding post 51 leading to the other line connecting wire 43. In other words, when this shaft is pushed in, the ringing circuit is closed. However, when operation of the hand generator ceases, the tongue 49 en gages a contact 52 which is connected by a wire 53 with a binding post or clip 54 from which leads a wire 55 extending to the contact30. This binding post 54 is connected by a wire 56 with buzzer 57 having a wire 58- leading therefrom to a binding post 59 connected by a wire 60-with the post 42. Thus the buzzer is always in connection when the talking circuit is in use. It is to be observed that all of these parts are of the standard construction.

In order to operate the magneto, a suitable opening 61 is made in one side wall, and in this opening is a rotary disk 62 of insulating material, pivoted towhich is a folding handle 63 normally resting in a slot formed in said side wall. 'vvhen the handle is raised to rotate the disk, and the disk is rotated, this action forces the shaft section 48 inwardly and closes the ringing circuit as before described.

Secured to the casing, body so as to entirely close the rear thereof, is a rear closure plate a heavy hand grip 66 molded integrally therewith. This plate is normally held, to close the casing, by screws 67 engaging in the bottom 10 and in lugs 68 molded with the top of the casing. .As the screws 67 and the contiguous parts of the main casing member entirely close the screw-holes in the margin of the plate 65, and as the member 65 is entirely imperforate with the exception of the marginal screw-holes, it may be properly considered to be substantially imperforate, for no electric charge, water or other fluid can pass therethrough when it is in position over the open side of the main casing member. Suitable straps 69, secured in the conducting wireholder 44, and a lug 70, serve to support the device on the operators shoulder when carrying the same.

Each of the wires 43 is provided'with a terminal clamp 71, protected by a sleeve 72 of hard rubber or other suitable insulating material, which is compressible for opening the line connecting clamp 71.

The panel 18 is secured to a block or base 72 by means of one or'more screws 73, or by other appropriate means, and this block 72 is of insulating material, is apertured for the shank 27 to extend therethrough, also to provide a continuation of the speaking channel or opening 17, and provides a support for the hand generator, buzzer, induction coil and their electric connections and adjuncts such as the battery holder 40, the transmitter mech- The receiver tube 19 is prefanism 37, etc. erably screwed into an opening in the upper part of the insulating panel 18, so it can be separately removed when desired after the rear wall 65 is removed. However, it should be understood that the receiver, transmitter,

generator, buzzer, induction coil, battery holder and their electric connections with one another and withthe insulating panel 18 and base 17 form a unit which is bodily removable from the casing when the rear wall 65 is removed together with the cushion pads 24 and 25. When such rear wall is removed, it 1s only necessary to disconnect the terminals of the line connecting wires 43, and withdraw such line connecting wires from the casing, whereupon the entire and unitary internal mechanism of the device can be bodily removed from the casing for the purpose of reso v pairing or replacing any of the parts of such a unit. Moreover, in case of injury to the easing, the said unitaryinternal mechanism can be transferred to another insulating casing of the kind herein shown and described.

In operatingthe device, connection is made drop, whereupon the talking circuit is closed, 7

by pushing the button 26 inward, and the operator may converse with the person called. Calls are received in the usual manner through the buzzer 57.

There has thus been provided a simple and efiicient device of the kind described and for the purpose specified.

It is obvious that minor changes may be made in the form and construction of the invention without departing from the material spirit thereof. It is not, therefore, desired to confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

What I claim as my invention is:

1. In a portable safety testing telephone, a hollow casing member formed integrally and consisting entirely of waterproof electric insulating material and having only one open side, and including two other sides and a top and a bottom adapted to combine with a closure member so as to exclude water and electric charges from passing through said open side, one of said other sides having formed integrally therewith a mouth piece and an ear piece which communicate with the interior of the casing member, substantially as shown.

2. In a portable safety testing telephone, a hollow casing member formed integrally and consisting entirely ofwaterproof electric insulating material and having only one open side, and including two other sides and a top and a bottom adapted to combine with r a closure member so as to exclude water and low casing member formed integrally and consisting entirely of waterproof electric insulator material and having only one open side, two other sides and a top and bottom beingadaptedto combinewith a closure member so as to exclude water and electric charges a from passing through said open side, the

side opposite to said open side having an ear piece and a mouth piece formed integrally therewith and communicating with the interior of the casing member, and a combined closure and handle which is substantially imperforate and formed of waterproof insulating material and provided with means to secure it to the said casing member in the position for closing said open side and in such position that said ear piece and'mouth piece are sheltered from rain and other falling matter when the casing member is suspended from the handle while being carried by the handle.

4. A portable telephone comprising a casing formed of two separable units which are rior, a telephonic arrangement in said casing and including a transmitter adjacent to the lower one of said protrusions and operable by sound waves entering through the latter, said telephonic arrangement including a receiver contiguous to the upper one of said 'hollow protrusions, said telephonicarrangement also including appropriate electric connections provided with means to connect them to an external circuit, and a circuit closing device for such electrical connections, said circuit closing device including a manipulative element of insulating material which extends through and closes said guide opening and is operable to close the circuit while preventing an electric current from passing through the guide opening.

5. A portable telephone comprising a casing member which includes a top and bottom and side walls and a front wall formed and united integrally of electric insulating material, said front wall including upper and lower openings which communicate with the interior and with the outer air, a telephonic arrangement in said casing and including a transmitter adjacent to the lower opening, and a receiver adjacent to the upper opening, said telephonic arrangement including a hand generator comprising a shaft which extends through a wall of the casing, which wall is apertured to receive said shaft, and which wall is also provided with a re cess around this shaft-receiving aperture, an insulating disk in said recess and secured to said shaft, and a handle on said insulating disk and cooperative therewith for turning said shaft, said telephonic arrangement also including electric connections attachable to an outer circuit.

6. In a portable telephone, a casing including front and rear walls, said front wall including an ear piece and a mouth piece formed and united integrally therewith and having openings from the exterior to the interior of the casing, said rear wall having a handle thereon and being effective to carry the casing with said front wall facing downward so as to exclude rain and other falling substances from said openings.

In testimony whereof I affix my signature.

ROBERT S. COOPER. 

